Sinatra Peepcode. Another brilliant video by Dan Benjamin. He builds a simple Ad display app using a Datamapper backend. This video has a particularly good ‘Advanced Topics’ section at the end.

Other Stuff

Build a Pastie Clone. A fantastic blog post that introduced me to the Datamapper ORM. Well written by Nick Plante, it is an easy to follow tutorial to build a Pastie clone.

The 12 Rules of Sinatra The Ruby Guru himself, Satish Talim asks some high profile Sinatra developers what the are the 12 most important rules of Sinatra. All of the answers are great and really useful!